Re: [go-nuts] Re: What does "nil implay?
On Wednesday, 23 January 2019 13:31:13 UTC+1, Victor Giordano wrote: > > You wrote > > >> All nil values are perfectly defined: they are the zero value of the >> particular type. > > > As i see things the nil is the *default value* for the pointers. If you > want to call it "zero value" to the default is up to, for me doesn't work > like that. For me "zero" (0) is a value and "nil" is another value. > The term "zero value" in regard to Go's types and values is *not* subject to discussion, personal opinion or taste but has a defined meaning: It is a specified technical term. Please take some minutes and look it up in the language spec. The term "the zero value of type X" has a defined meaning and must not be conflated with the integer literal 0. If you want to discuss physics you have to stick your meaning of "energy" or "momentum" to the official technical terms if you want to be taken serious. V. > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [go-nuts] Re: What does "nil implay?
On Wed, Jan 23, 2019 at 1:30 PM Victor Giordano wrote: > You wrote > > All nil values are perfectly defined: they are the zero value of the particular type. > > As i see things the nil is the default value for the pointers. If you want to call it "zero value" to the default is up to, for me doesn't work like that. For me "zero" (0) is a value and "nil" is another value. > > Hope you get what i'm saying. No I don't, sorry. Zero (0) is a number. Numbers (types int, intNN, float32, ...) cannot have a nil value. I don't understand how numbers got involved in this discussion about nil values. They're not related. But some types allow nil values (chan T, []T, ...). Nil values of such types are equal to the zero value of that type. So nil values are well defined. -- -j -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [go-nuts] Re: What does "nil implay?
You wrote > All nil values are perfectly defined: they are the zero value of the > particular type. As i see things the nil is the *default value* for the pointers. If you want to call it "zero value" to the default is up to, for me doesn't work like that. For me "zero" (0) is a value and "nil" is another value. Hope you get what i'm saying. -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [go-nuts] Re: What does "nil implay?
On Wed, Jan 23, 2019 at 1:09 PM Victor Giordano wrote: > 0 != nil I don't understand what is has to do with what I wrote. Your example is not a valid Go expression. Not all types have nil values. Let me reiterate: A nil value of a type is always equal to the zero value of that type. Because zero value of a type is well defined, a nil value of a type is also well defined. -- -j -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [go-nuts] Re: What does "nil implay?
0 != nil El mié., 23 ene. 2019 a las 9:08, Jan Mercl (<0xj...@gmail.com>) escribió: > On Wed, Jan 23, 2019 at 12:45 PM Victor Giordano > wrote: > > >> All nil values are perfectly defined: they are the zero value of the > particular type. > > > > Just to point.. .zero is value different that nil. > > Not sure what's meant by this. When is a nil value of a type different > from its zero value? > > -- > > -j > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [go-nuts] Re: What does "nil implay?
On Wed, Jan 23, 2019 at 12:45 PM Victor Giordano wrote: >> All nil values are perfectly defined: they are the zero value of the particular type. > > Just to point.. .zero is value different that nil. Not sure what's meant by this. When is a nil value of a type different from its zero value? -- -j -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [go-nuts] Re: What does "nil implay?
El martes, 22 de enero de 2019, 10:23:36 (UTC-3), Jan Mercl escribió: > > On Tue, Jan 22, 2019 at 2:17 PM Victor Giordano > wrote: > > > From a language specific level (higher abstraction) is means undefined, > is the absence of a value. > > No value in Go can _not_ have a value. > > > Something whose value is nil/null/undefined is not defined. > > All nil values are perfectly defined: they are the zero value of the > particular type. > Just to point.. .zero is value different that nil. > > -- > > -j > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [go-nuts] Re: What does "nil implay?
I was giving an interpretaion about the meaning of nil from different pespectives El martes, 22 de enero de 2019, 10:23:36 (UTC-3), Jan Mercl escribió: > > On Tue, Jan 22, 2019 at 2:17 PM Victor Giordano > wrote: > > > From a language specific level (higher abstraction) is means undefined, > is the absence of a value. > > No value in Go can _not_ have a value. > > > Something whose value is nil/null/undefined is not defined. > > All nil values are perfectly defined: they are the zero value of the > particular type. > > -- > > -j > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [go-nuts] Re: What does "nil implay?
On Tue, Jan 22, 2019 at 2:17 PM Victor Giordano wrote: > From a language specific level (higher abstraction) is means undefined, is the absence of a value. No value in Go can _not_ have a value. > Something whose value is nil/null/undefined is not defined. All nil values are perfectly defined: they are the zero value of the particular type. -- -j -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [go-nuts] Re: What does "nil implay?
i just make an anwser. El lunes, 21 de enero de 2019, 19:21:29 (UTC-3), Ian Lance Taylor escribió: > > On Mon, Jan 21, 2019 at 5:19 AM 伊藤和也 > > wrote: > > > > So what do you think "nil" represents instead? > > "nil" is just a special value? for slices, maps. > > There is no one answer to that question. > > As you know, `nil` is the value of an uninitialized variable of > interface, slice, pointer, map, function, or channel type. Beyond > that it has no shared meaning. For each of those types, the value > `nil` behaves differently, in a way that makes sense for the type. > See also https://golang.org/issue/22729. > > Ian > > > > > 2019年1月21日月曜日 8時00分24秒 UTC+9 伊藤和也: > >> > >> I know "nil" is zero values for slices, maps, interfaces, etc but I > don't know what "nil" implays. Does nil implay the absence of value or a > variable has't been initialized yet or something else? > > > > -- > > You received this message because you are subscribed to the Google > Groups "golang-nuts" group. > > To unsubscribe from this group and stop receiving emails from it, send > an email to golang-nuts...@googlegroups.com . > > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [go-nuts] Re: What does "nil implay?
On Mon, Jan 21, 2019 at 5:19 AM 伊藤和也 wrote: > > So what do you think "nil" represents instead? > "nil" is just a special value? for slices, maps. There is no one answer to that question. As you know, `nil` is the value of an uninitialized variable of interface, slice, pointer, map, function, or channel type. Beyond that it has no shared meaning. For each of those types, the value `nil` behaves differently, in a way that makes sense for the type. See also https://golang.org/issue/22729. Ian > 2019年1月21日月曜日 8時00分24秒 UTC+9 伊藤和也: >> >> I know "nil" is zero values for slices, maps, interfaces, etc but I don't >> know what "nil" implays. Does nil implay the absence of value or a variable >> has't been initialized yet or something else? > > -- > You received this message because you are subscribed to the Google Groups > "golang-nuts" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to golang-nuts+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [go-nuts] Re: What does "nil implay?
Actually, that's not the whole story. For example, take a look at this example: https://play.golang.org/p/Wxq8vrBoqDr Inanc Gumus learngoprogramming.com On Mon, Jan 21, 2019 at 8:05 PM diego patricio wrote: > From stackoverflow, i think that is a proper explanation > > [image: image.png] > > https://stackoverflow.com/questions/35983118/what-does-nil-mean-in-golang > > Regards > > El lun., 21 ene. 2019 a las 14:19, 伊藤和也 () > escribió: > >> So what do you think "nil" represents instead? >> "nil" is just a special value? for slices, maps. >> >> 2019年1月21日月曜日 8時00分24秒 UTC+9 伊藤和也: >>> >>> I know "nil" is zero values for slices, maps, interfaces, etc but I >>> don't know what "nil" implays. Does nil implay the absence of value or a >>> variable has't been initialized yet or something else? >>> >> -- >> You received this message because you are subscribed to the Google Groups >> "golang-nuts" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to golang-nuts+unsubscr...@googlegroups.com. >> For more options, visit https://groups.google.com/d/optout. >> > -- > You received this message because you are subscribed to a topic in the > Google Groups "golang-nuts" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/golang-nuts/6LSHq2Bc8Gk/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > golang-nuts+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [go-nuts] Re: What does "nil implay?
>From stackoverflow, i think that is a proper explanation [image: image.png] https://stackoverflow.com/questions/35983118/what-does-nil-mean-in-golang Regards El lun., 21 ene. 2019 a las 14:19, 伊藤和也 () escribió: > So what do you think "nil" represents instead? > "nil" is just a special value? for slices, maps. > > 2019年1月21日月曜日 8時00分24秒 UTC+9 伊藤和也: >> >> I know "nil" is zero values for slices, maps, interfaces, etc but I don't >> know what "nil" implays. Does nil implay the absence of value or a variable >> has't been initialized yet or something else? >> > -- > You received this message because you are subscribed to the Google Groups > "golang-nuts" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to golang-nuts+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [go-nuts] Re: What does "nil implay?
Nil = Uninitialized (slices, maps, channels, funcs etc) Nil = Doesn't point to anything (pointers) And so on. -- Inanc Gumus https://learngoprogramming.com On Mon, Jan 21, 2019 at 4:19 PM 伊藤和也 wrote: > So what do you think "nil" represents instead? > "nil" is just a special value? for slices, maps. > > 2019年1月21日月曜日 8時00分24秒 UTC+9 伊藤和也: >> >> I know "nil" is zero values for slices, maps, interfaces, etc but I don't >> know what "nil" implays. Does nil implay the absence of value or a variable >> has't been initialized yet or something else? >> > -- > You received this message because you are subscribed to a topic in the > Google Groups "golang-nuts" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/golang-nuts/6LSHq2Bc8Gk/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > golang-nuts+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
